Disable I.E. Explorer Backspace Key???

You have two questions in one that donot pertain to one another,you can modify the back button that is in the task bar of IE,right-click on the gray task bar area and choose customize,then click on the button in the right pane and click add to move it to the left pane,you will not see the back button in task bar
The other part is that the backspace key cannot be disabled and still function when you want to edit text.